{"id":17494,"date":"2020-06-14T14:18:57","date_gmt":"2020-06-14T14:18:57","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-o-conversor-de-neutrons-como-os-neutrons-podem-ser-detectados-definicao\/"},"modified":"2020-07-21T10:33:09","modified_gmt":"2020-07-21T10:33:09","slug":"o-que-e-o-conversor-de-neutrons-como-os-neutrons-podem-ser-detectados-definicao","status":"publish","type":"post","link":"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-conversor-de-neutrons-como-os-neutrons-podem-ser-detectados-definicao\/","title":{"rendered":"O que \u00e9 o conversor de n\u00eautrons &#8211; Como os n\u00eautrons podem ser detectados &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-u-clearfix su-u-trim\">Geralmente, todo tipo de detector de n\u00eautrons deve estar equipado com conversor (para converter a radia\u00e7\u00e3o de n\u00eautrons em radia\u00e7\u00e3o detect\u00e1vel comum) e um dos detectores de radia\u00e7\u00e3o convencionais.\u00a0Dosimetria de Radia\u00e7\u00e3o<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<figure id=\"attachment_11545\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-11545\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/neutron-detection.png\"><img loading=\"lazy\" class=\"wp-image-11545 size-medium lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/neutron-detection-300x232.png\" alt=\"detec\u00e7\u00e3o de n\u00eautrons\" width=\"300\" height=\"232\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/neutron-detection-300x232.png\" \/><\/a><figcaption id=\"caption-attachment-11545\" class=\"wp-caption-text\">Geralmente, todo tipo de detector de n\u00eautrons deve estar equipado com conversor e um dos detectores de radia\u00e7\u00e3o convencionais.<br \/>\nFonte: large.stanford.edu<\/figcaption><\/figure>\n<p><strong>A detec\u00e7\u00e3o de n\u00eautrons<\/strong>\u00a0\u00e9 muito espec\u00edfica, uma\u00a0vez que os n\u00eautrons s\u00e3o<strong>\u00a0part\u00edculas eletricamente neutras;<\/strong>\u00a0\u00a0portanto, est\u00e3o sujeitas principalmente a fortes for\u00e7as nucleares, mas n\u00e3o a for\u00e7as el\u00e9tricas.\u00a0Portanto, os n\u00eautrons<strong>\u00a0n\u00e3o<\/strong>\u00a0s\u00e3o<strong>\u00a0diretamente ionizantes<\/strong>\u00a0e geralmente precisam ser<strong>\u00a0convertidos<\/strong>\u00a0em part\u00edculas carregadas antes que possam ser detectados.\u00a0Geralmente, todo tipo de detector de n\u00eautrons deve estar equipado com conversor (para converter a radia\u00e7\u00e3o de n\u00eautrons em radia\u00e7\u00e3o detect\u00e1vel comum) e um dos detectores de radia\u00e7\u00e3o convencionais (detector de cintila\u00e7\u00e3o, detector de gases, detector de semicondutores, etc.).<\/p>\n<h2>Conversores de n\u00eautrons<\/h2>\n<p>Dois tipos b\u00e1sicos de intera\u00e7\u00f5es de n\u00eautrons com a mat\u00e9ria est\u00e3o dispon\u00edveis para esse fim:<\/p>\n<ul>\n<li><strong><a title=\"Dispers\u00e3o El\u00e1stica de N\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-elastic-scattering\/\">Espalhamento el\u00e1stico<\/a>\u00a0.\u00a0<\/strong>O n\u00eautron livre pode ser espalhado por um n\u00facleo, transferindo parte de sua energia cin\u00e9tica para o n\u00facleo.\u00a0Se o n\u00eautron tiver energia suficiente para dispersar os n\u00facleos, o n\u00facleo de recuo ioniza o material ao redor do conversor.\u00a0De fato,<strong>\u00a0apenas os<\/strong>\u00a0n\u00facleos de<strong>\u00a0hidrog\u00eanio e h\u00e9lio<\/strong>\u00a0s\u00e3o leves o suficiente para aplica\u00e7\u00e3o pr\u00e1tica.\u00a0A carga produzida dessa maneira pode ser coletada pelo detector convencional para produzir um sinal detectado.\u00a0Os n\u00eautrons podem transferir mais energia para os n\u00facleos leves.\u00a0Este m\u00e9todo \u00e9 apropriado para detectar<strong>\u00a0n\u00eautrons r\u00e1pidos<\/strong>\u00a0(os<strong>\u00a0n\u00eautrons<\/strong>\u00a0r\u00e1pidos n\u00e3o possuem uma se\u00e7\u00e3o transversal alta para absor\u00e7\u00e3o), permitindo a detec\u00e7\u00e3o de n\u00eautrons r\u00e1pidos sem um<a title=\"Moderador de n\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/neutron-moderator\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u00a0moderador<\/a>\u00a0.<\/li>\n<li><strong><a title=\"Absor\u00e7\u00e3o de N\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-absorption\/\">Absor\u00e7\u00e3o de n\u00eautrons<\/a>\u00a0.\u00a0<\/strong>Este \u00e9 um m\u00e9todo comum que permite a detec\u00e7\u00e3o de n\u00eautrons de<strong>\u00a0todo o espectro de energia<\/strong>\u00a0.\u00a0Este m\u00e9todo baseia-se em v\u00e1rias<a title=\"Rea\u00e7\u00f5es nucleares\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/nuclear-reactions\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u00a0rea\u00e7\u00f5es<\/a>\u00a0de<a title=\"Nuclear Reactions\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/nuclear-reactions\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u00a0absor\u00e7\u00e3o<\/a>\u00a0(<a title=\"Captura de N\u00eautrons - Captura Radiativa\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-capture-radiative-capture\/\">\u00a0captura de radia\u00e7\u00e3o<\/a>\u00a0,<a title=\"Fic\u00e3o nuclear\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u00a0fiss\u00e3o nuclear<\/a>\u00a0, rea\u00e7\u00f5es de rearranjo, etc.).\u00a0O n\u00eautron \u00e9 aqui absorvido pelo material alvo (conversor) que emite<strong>\u00a0part\u00edculas secund\u00e1rias<\/strong>\u00a0, como pr\u00f3tons, part\u00edculas alfa, part\u00edculas beta, f\u00f3tons (<a title=\"Raios gama \/ radia\u00e7\u00e3o gama\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\">\u00a0raios gama<\/a>\u00a0) ou fragmentos de fiss\u00e3o.\u00a0Algumas rea\u00e7\u00f5es s\u00e3o rea\u00e7\u00f5es limiares (exigindo uma energia m\u00ednima de n\u00eautrons), mas a maioria das rea\u00e7\u00f5es ocorre nas<strong>\u00a0energias<\/strong>\u00a0epit\u00e9rmica e<strong>\u00a0t\u00e9rmica<\/strong>.\u00a0Isso significa que a modera\u00e7\u00e3o dos n\u00eautrons r\u00e1pidos \u00e9 necess\u00e1ria, levando a informa\u00e7\u00f5es ruins sobre a energia dos n\u00eautrons.\u00a0Os n\u00facleos mais comuns para o material conversor de n\u00eautrons s\u00e3o:\n<ul>\n<li><strong><sup>10<\/sup>\u00a0B (n, a).\u00a0<\/strong>Onde a se\u00e7\u00e3o transversal de captura de n\u00eautrons para n\u00eautrons t\u00e9rmicos \u00e9 \u03c3 = 3820 celeiros e o<a title=\"Boro 10\" href=\"https:\/\/www.nuclear-power.com\/glossary\/boron-10\/\">\u00a0boro<\/a>\u00a0naturalpossui abund\u00e2ncia de<sup>\u00a010<\/sup>\u00a0B 19,8%.<\/li>\n<li><strong><sup>3<\/sup>\u00a0Ele (n, p).\u00a0<\/strong>Onde a se\u00e7\u00e3o transversal de captura de n\u00eautrons para n\u00eautrons t\u00e9rmicos \u00e9 \u03c3 = 5350 celeiros e o h\u00e9lio natural possui abund\u00e2ncia de<sup>\u00a03<\/sup>\u00a0He 0,014%.<\/li>\n<li><strong><sup>6<\/sup>\u00a0Li (n, a).\u00a0<\/strong>Onde a se\u00e7\u00e3o transversal de captura de n\u00eautrons para n\u00eautrons t\u00e9rmicos \u00e9 \u03c3 = 925 celeiros e o l\u00edtio natural tem abund\u00e2ncia de<sup>\u00a06<\/sup>\u00a0Li 7,4%.<\/li>\n<li><strong><sup>113<\/sup>\u00a0Cd (n, \u0263).\u00a0<\/strong>Onde a se\u00e7\u00e3o transversal de captura de n\u00eautrons para n\u00eautrons t\u00e9rmicos \u00e9 \u03c3 = 20820 celeiros e o<a title=\"C\u00e1dmio\" href=\"https:\/\/www.nuclear-power.com\/glossary\/cadmium\/\">\u00a0c\u00e1dmio<\/a>\u00a0naturalpossui abund\u00e2ncia de<sup>\u00a0113<\/sup>\u00a0Cd 12,2%.<\/li>\n<li><strong><sup>235<\/sup>\u00a0U (n, fiss\u00e3o).\u00a0<\/strong>Onde a se\u00e7\u00e3o de fiss\u00e3o para n\u00eautrons t\u00e9rmicos \u00e9 \u03c3 = 585 celeiros e o ur\u00e2nio natural tem abund\u00e2ncia de<sup>\u00a0235<\/sup>\u00a0U 0,711%.\u00a0O ur\u00e2nio como conversor produz fragmentos de fiss\u00e3o que s\u00e3o part\u00edculas carregadas pesadas.\u00a0Isso tem uma vantagem significativa.\u00a0As part\u00edculas carregadas pesadas (fragmentos de fiss\u00e3o) criam um sinal de sa\u00edda alto, porque os fragmentos depositam uma grande quantidade de energia em um volume sens\u00edvel ao detector.\u00a0Isso permite uma discrimina\u00e7\u00e3o f\u00e1cil da radia\u00e7\u00e3o de fundo (radia\u00e7\u00e3o ei gama).\u00a0Esta caracter\u00edstica importante pode ser usada, por exemplo, em uma medi\u00e7\u00e3o de pot\u00eancia de reator nuclear, em que o campo de n\u00eautrons \u00e9 acompanhado por um fundo gama significativo.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><span>Exemplo &#8211; Conversor de N\u00eautrons<\/span><\/h2>\n<h3><span id=\"Fission_Chamber_8211_Wide_Range_Detectors\"><span>C\u00e2mara de fiss\u00e3o &#8211; detectores de ampla faixa<\/span><\/span><\/h3>\n<p><strong><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/nuclear-instrumentation\/excore-nuclear-instrumentation\/fission-chamber-wide-range-detectors\/\"><span><img src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/fission-chamber-detection-of-neutrons.png\" \/>As c\u00e2maras de fiss\u00e3o<\/span><\/a><\/strong><span>\u00a0\u00a0s\u00e3o detectores de ioniza\u00e7\u00e3o usados \u200b\u200bpara detectar n\u00eautrons.\u00a0As c\u00e2maras de fiss\u00e3o podem ser usadas como detectores de faixa intermedi\u00e1ria para monitorar o fluxo de n\u00eautrons (pot\u00eancia do reator) no n\u00edvel do fluxo intermedi\u00e1rio.\u00a0Eles tamb\u00e9m fornecem indica\u00e7\u00e3o, alarmes e sinais de disparo do reator.\u00a0O design deste instrumento \u00e9 escolhido para fornecer sobreposi\u00e7\u00e3o entre os canais da faixa da fonte e a amplitude total dos instrumentos da faixa de pot\u00eancia.<\/span><\/p>\n<p><span>No caso de\u00a0<\/span><strong><span>c\u00e2maras<\/span><\/strong><span>\u00a0de\u00a0\u00a0<strong>fiss\u00e3o<\/strong>\u00a0, a c\u00e2mara \u00e9 revestida com uma fina camada de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-235\/\"><span>ur\u00e2nio 235<\/span><\/a><span>\u00a0altamente enriquecido\u00a0\u00a0\u00a0para detectar n\u00eautrons.\u00a0Os n\u00eautrons\u00a0\u00a0<\/span><strong><span>n\u00e3o ionizam diretamente<\/span><\/strong><span>\u00a0\u00a0e geralmente precisam ser\u00a0\u00a0<\/span><strong><span>convertidos<\/span><\/strong><span>\u00a0\u00a0em part\u00edculas carregadas antes de serem detectadas.\u00a0Um\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/thermal-neutron\/\"><span>n\u00eautron t\u00e9rmico<\/span><\/a><span>\u00a0\u00a0causar\u00e1 a\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/\"><span>fiss\u00e3o de<\/span><\/a><span>\u00a0um \u00e1tomo de ur\u00e2nio-235\u00a0\u00a0, com os dois\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/fission-fragments\/\"><span>fragmentos de fiss\u00e3o<\/span><\/a><span>\u00a0\u00a0produzidos com alta\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-kinetic-energy\/\"><span>energia cin\u00e9tica<\/span><\/a><span>\u00a0\u00a0e causando ioniza\u00e7\u00e3o do g\u00e1s arg\u00f4nio no detector.\u00a0Uma vantagem do uso de revestimento de ur\u00e2nio-235 em vez do boro-10 \u00e9 que os fragmentos de fiss\u00e3o t\u00eam uma energia muito maior do que a part\u00edcula alfa de uma rea\u00e7\u00e3o de boro.\u00a0Portanto\u00a0<\/span><strong><span>As c\u00e2maras de fiss\u00e3o<\/span><\/strong><span>\u00a0\u00a0s\u00e3o\u00a0\u00a0<\/span><strong><span>muito sens\u00edveis<\/span><\/strong><span>\u00a0\u00a0ao fluxo de n\u00eautrons e isso permite que as c\u00e2maras de fiss\u00e3o operem em\u00a0\u00a0<\/span><strong><span>campos gama mais altos do<\/span><\/strong><span>\u00a0\u00a0que uma c\u00e2mara de \u00edons descompensada com revestimento de boro.<\/span><\/p>\n<h3><span>Recoil de pr\u00f3tons &#8211; detectores de recuo<\/span><\/h3>\n<p><span>O tipo mais importante de detectores para n\u00eautrons r\u00e1pidos s\u00e3o aqueles que detectam diretamente\u00a0<\/span><strong><span>part\u00edculas de recolhimento<\/span><\/strong><span>\u00a0, em particular\u00a0<\/span><strong><span>pr\u00f3tons de recolhimento<\/span><\/strong><span>\u00a0resultantes da dispers\u00e3o el\u00e1stica (n, p).\u00a0De fato, apenas os n\u00facleos de hidrog\u00eanio e h\u00e9lio s\u00e3o leves o suficiente para aplica\u00e7\u00e3o pr\u00e1tica.\u00a0Neste \u00faltimo caso, as part\u00edculas de recuo s\u00e3o detectadas em um detector.\u00a0Os n\u00eautrons podem transferir mais energia para os n\u00facleos leves.\u00a0Este m\u00e9todo \u00e9 apropriado para detectar n\u00eautrons r\u00e1pidos, permitindo a detec\u00e7\u00e3o de n\u00eautrons r\u00e1pidos sem um\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/neutron-moderator\/\"><span>moderador<\/span><\/a><span>\u00a0.\u00a0Este m\u00e9todo permite que a energia do n\u00eautron seja medida juntamente com a flu\u00eancia do n\u00eautron, ou seja, o detector pode ser usado como um espectr\u00f4metro.\u00a0Os detectores r\u00e1pidos de n\u00eautrons t\u00edpicos s\u00e3o\u00a0<\/span><strong><span>cintiladores l\u00edquidos<\/span><\/strong><span>, detectores de g\u00e1s nobre \u00e0 base de h\u00e9lio-4 e detectores de pl\u00e1stico (cintiladores).\u00a0Por exemplo, o pl\u00e1stico tem um alto teor de hidrog\u00eanio, portanto, \u00e9 \u00fatil para\u00a0<\/span><strong><span>detectores r\u00e1pidos de n\u00eautrons<\/span><\/strong><span>\u00a0, quando usado como cintilador.<\/span><\/p>\n<\/div>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Este artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Geralmente, todo tipo de detector de n\u00eautrons deve estar equipado com conversor (para converter a radia\u00e7\u00e3o de n\u00eautrons em radia\u00e7\u00e3o detect\u00e1vel comum) e um dos detectores de radia\u00e7\u00e3o convencionais.\u00a0Dosimetria de Radia\u00e7\u00e3o Geralmente, todo tipo de detector de n\u00eautrons deve estar equipado com conversor e um dos detectores de radia\u00e7\u00e3o convencionais. Fonte: large.stanford.edu A detec\u00e7\u00e3o de &#8230; <a title=\"O que \u00e9 o conversor de n\u00eautrons &#8211; Como os n\u00eautrons podem ser detectados &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-conversor-de-neutrons-como-os-neutrons-podem-ser-detectados-definicao\/\" aria-label=\"More on O que \u00e9 o conversor de n\u00eautrons &#8211; Como os n\u00eautrons podem ser detectados &#8211; Defini\u00e7\u00e3o\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[51],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 o conversor de n\u00eautrons - Como os n\u00eautrons podem ser detectados - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Geralmente, todo tipo de detector de n\u00eautrons deve estar equipado com conversor (para converter a radia\u00e7\u00e3o de n\u00eautrons em radia\u00e7\u00e3o detect\u00e1vel comum) e um dos detectores de radia\u00e7\u00e3o convencionais. 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